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Post by davy on Apr 15, 2018 10:10:27 GMT
Has anyone tried this Canon DSLR fitted to a filter wheel then a canon lens to the filter, Something I'm looking at just now,can't find any images of this on searches I've done,,, so kinda looks like a dead duck idea,,, or nobody daft enough to try it. ERM. Suggestions lol Like above but change zwo camera for a DSLR
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Post by davy on Apr 15, 2018 10:21:09 GMT
www.cam-fi.com/en/index.htmlI would like to try the idea in first post on this thread,, won't be too upset if the DSLR, filter wheel, lens combo won't work,, think in theory it should,, but the filter wheel in zwo will.. So that's the concept But the canon will be operated via WiFi and tablet or phone even laptop,, Done a bit of testing and it can be linked to astro toaster,, indirectly but working on a better fix
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Post by howie1 on Apr 16, 2018 1:46:09 GMT
I've seen guy selling star adventurer on aussie ice in space forum where he has totally replaced the star adventurer counterweight with the finder guider + zwo combo attached way down at the bottom of the counterweight bar - that overall reduces the total weight of the rig as well as less to carry out if hiking or looking for lightweight compact travel rig. The reduction in total weight is having a star adventurer I know the thing wobbles on a camera tripod. So less weight in total the better, and the lower centre of gravity the better.
I was just thunking about this last weekend thinking to get out again with the Rokinon 135mm f/2.0 and sigma 50mm f/1.4 on the SA. So am going to make some adapter this week to so that.
Re DSLR and filter wheel, no never seen anyone with filter wheel between the lens and DSLR. But question in case anyone knows ... what happens if you have a 2" filter wheel and place it in front of the lens mounted on the DSLR ... so not lens then filter wheel then DSLR body, but filter wheel then lens mounted on DSLR. I already have a dovetail which holds the DSLR on 1/4" bolt and the rokinon lens in a single guidescope ring, and there's still threaded holes left in front of the guide rings IE make an adapter which holds or afixes the filter wheel just in front of the lens?
And just to complete the "ideas fest" I'm experiencing at the moment (LOL) I've seen a bloke at one star party use 1-1/4" OIII, SII, Ha filters mounted in custom 3d printer 'inserts' which he pushes into his DSLR when its connected prime focus on his scope. The 1-1/4" filters are half the price of the 2" versions and 1/3 the price of the slip in EOS/Nikon filters so he saves money using only 1-1/4" ... and he does get slightly more vignetting but really not much more. And he deals with the vignetting by flats so the images look fine. It's not automated ie a filter wheel as the have to be inserted manually into the camera but it does work and offered here as another out of curiousity / ideas fest for VA and imaging in general.
cheers
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Post by ChrisV on Apr 16, 2018 2:53:58 GMT
Interesting idea Howie. I suppose with the filter wheel in front of lens - the filter might get a bit yucky being exposed? Also moisture into the filter wheel if you are using a motorised one.
A lot of people use 1 1/4" filters with the 4/3 sized sensors and they are fine. But I imagine you must get some vignetting with an APS-C sensor on a dslr. But is this a problem with live imaging - I doubt it. As you say, I've also found that astrotoaster compensates really well for stuff like that when you use flats - I just take some sky flats while its still a bit light.
I don't think you need 2" for DSLR sized sensors. 36mm is enough and umounted 36mm isn't too much more than mounted 1 1/4" filters (Maybe?). I splurged and got a 7x 36mm motorised wheel from ZWO. I'm getting unmounted 36mm Baader filters for it - so far have L/R/G/B and H-alpha. They are parfocal so no refocusing between filters. Or if you want to buy a manual filter wheel a ZWO 5x 1&1/4" is only $139. And could probably pick up one second hand cheaper from an imager who got frustrated with it and is moving to a motorised one.
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Post by howie1 on Apr 16, 2018 9:19:00 GMT
......... if you want to buy a manual filter wheel a ZWO 5x 1&1/4" is only $139. And could probably pick up one second hand cheaper from an imager who got frustrated with it and is moving to a motorised one. I like the sound of a manual one for $139 ! Thumsup for that Chris! Cheers Skyflats ... yup I read the DSS author/creators FAQ's and saw he says either there or on a forum that skyflats are fine ... saves me trying to buy a large panel off eBay for the 8" newt and laying it flat against a Newt pointing upwards to balance it on top, etc. But, interesting he said somewhere in my Google hunting, it's ok even if you don't put a white T shirt over the aperture when exposing against the light blue sky! He says as the colors for the flats within DSS are processed per channel or before debayering / in mono, or something like that, so it copes with slight hue's (other than white) very well and works fine without the T shirt! Haven't tried it .... but very interesting!
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Post by ChrisV on Apr 16, 2018 10:30:50 GMT
Yep I used sky flats to run in astrotoaster. And didn't have a t-shirt on ...
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Post by howie1 on Apr 16, 2018 12:17:33 GMT
Yep I used sky flats to run in astrotoaster. And didn't have a t-shirt on ... Yeah, it's still pretty hot here too! LOL ... Oh, you mean on the scope .... LOL! Seriously, that's great news re skyflats and no need to stretch white T shirt over the aperture while shooting the sky. Thanks Chris.
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Post by ChrisV on Apr 16, 2018 12:49:47 GMT
And me! T-shirt off and howl at the receding moon. Scary stuff ... Its a pain to do inastrotoaster as you have to collect the flats then make a masterFlat in DSS. But I'm sure I also made them in sharpcap - it has a nice routine for it, save it as a FITS file, then open in fitwork and save as a tiff or whatever it is that astrotoaster needs. There was some convoluted file arrangement to make it work
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